Solid adjustable die-head.



H. L. FISHER.

SOLID ADJUSTABLE DIE HEAD.

APPLICATION FILED APRJS, 1911.

1 1 1 7, 363, Patented Nov 17, 1914.

2 BHEETB--SHEET 1.

H. L. FISHER.

SOLID ADJUSTABLE DIE HEAD.

APPLICATION FILED APR.6,1911.

1,1 17,363. Patented Nov. 17, 1914.

' 2 SHEETS-SHEET 2.

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l7 5 J: W 1 J4 5 FF E "ran STATES PATENT OFFICE.

HENRY LANDIS FISHER, F WAYIVESBORO, PENNSYLVANIA, ASSIGNOR T0 LANDIS MACHINE COMPANY, OF WAYNESBORO, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

To all whom it may concern:

Be it known that I, HENRY LANDIB FISHER,

a citizen of the United States, residing at Waynesboro, in the county of Franklin and State of Pennsylvania, have inventedcertain new and useful Improvements in Solid Adjustable Die-Heads, of which the following is a specification, reference being had therein to the accompanying drawing.

My invention relates to screw cutting devices, and particularly to die heads for use on screw machines and turret machinery.

The object of the invention is to produce what I term a solid adjustable die head, in which chaser feed is possible WlthOllt affecting the nature 01'' diameter of the cut, and in which the adjustments shall be so combined that any pitch of chasers can cut any diameter of work, without limit due to the clearance formed in the chaser, which has heretofore been found in all similar die heads, so far as I know.

Briefly stated, the invention comprises a head plate or body carrying radially ad-.

justable chaser blocks or die holders, each fitted with a tangentially adjustable chaser, giving long life with flexible rake, and a clamping stem, preferably connected to the body by automatically separable means, for forming .screw threads on blanks which when threaded a predetermined-length reverse their motion and back offthe die head.

In certain respects the present invention constitutes an improvement on that described in Letters Patent No. 864,964, granted to me September 3, 1907,'which included along life chaser with a serrated face in a die head of the self-opening type. The method of adjusting the chaser in the holder 4 to the tangential cutting position is the same herein as in said prlor patent, but in all other features the present head is radically diflerent.

My invention is illustrated in the accompanying drawings in which' Figure 1 is a face view of the die head. Fig. 2 is a side view thereof. Fig. 3 is a face view of one of the die blocks or chaser holders detached. Fig. 4 is a viewgsimilar to to Fig. 1, .showing the face plate or body with all other parts detached. Fig. 5 is a perspective view of a chaser detached. Fig. 6 is a face view of the holding plate 12 with the other parts removed.

In the drawings, 1 designates the head Specification of Letters Patent.

Application filed April 6, 1911.

SOLID ADJUSTABLE DIE-HEAD.

Patented Nov. 17, 1914. Serial No. 619,207.

plate or body upon which the four chaser holders 2 are screwed by bolts 3 (Fig. 52 passing into them from the rear throug slots 4 in the bod Eachblock or holder 2 receives one of t ese bolts 3, and in order to prevent lateral motion or side-play, each block is flanged as shown in dotted lines at 2 in Fig. 3, to fit grooves 6 in the body 1. These grooves are shown in Figs. 2 and 4. In the latter figure, it will be observed, four of the grooves are provided forming a rectangular figure about the center 10. Around the periphery of the plate are four projections 7 each having one side flush with the side of its adjacent groove 6, and each drilled and threaded to receive an adjusting screw 8, as shown in Fig. 1 in dotted lines. The outer face of each projection or post 7 is graduated at 9 to the scale which it is desired to use in the adjustment of the chaser holders.

In Fig. 3 a single die block or chaser holder is shown on a somewhat enlarged scale. The body 2 carries abottom flange 2 as already stated, a parallel top flange 2 bearing the zero point or adjusting line 2 to cooperate with the scale 9 on the body, and a resting flange or abutment 2 at right angles to the flan es 2 and 2- adapted to receive the lower edge of the chaser and with the overhanging clamping plate 2 to form a dovetail for holding the chaser firmly in position. It will be noted that at the end 2 the flange 2 is cutaway so as to. entirely clear the end of the chaser for a distance greater than the greatest depth of cut. The

curve of clearance at 2 has a suiliciently large radius to provide for work of the greatest diameter for which the blocks can be adjusted.

Each of the chasers 11 is formed of a straight strip with parallel serrations 11 in its face and one edge 11 inclined to form an element of a dovetail. In the back I form a groove 11" extending parallel to the face serrations or cutting tectlr, the lower part of this groove forming the other element of the chaser dovetail. The clamping plate 2 has parallel depending edge flanges, one of which takes into a groove in the block 2 and the other into the groove 11 in the back of the chaser. Each flange 2 is clamped firmly to its block 2 b screws 2 The lower edge of the chaser is cut away -to receive intermeshing threads on the adactness being secured by reading the scale 9; in each case. The blocks being thus placed, longitudinal adjustment I of the chasers if necessary,-is made by means of the screws 2 and the clamping screws 2' as work until reversal.

v and the headplate or well as bolts 3 having been tightly set up, the head is ready for use. Without any further fittings, except a suitable holding stem for the body 1, the ordinary procedure inuse would be to advance the die upon the blank to a predetermined point, then reverse the motion of drive and back the die off.

In practice, I have found it desirable to provide for an automatic release of the body 1 from its holding or clamping stem,

so that it would be free to rotate with the This enables a much closer cut to be made with safety and facilitates automatic control. Referring to- Fig. :2, 12 is a holding plate, having clamping stem 13, through :which passes the reduced stem 1460f the head plate or body 1. This stein. is tubular,"i'and contains a spring 15,

secured at its lower end to the clutch memher-16, which slides on the squared end of stem 1& and cooperates with a clutch mem'-'; her 16 on the clamping stem 13.. At its upper end thespring is attached to the stem 14, holding the parts 1 and 12 together, and causing a stud 17 on the inner face of the body 1 to engage a dog 18 secured to the plate '12. The parts being thus locked, the tool is used as before stated, but when. the end of the cut is reached, the forward motion of the clamping stem 18 is retarded, body 1 with the die holders is carried forward by the lead of the threading on the work, thus extending the spring 15, and disengagin the stud 17 from the dog 18. The head p ate and dies are thereupon free tr rotate with the blank, until the drive motion is reversed. Upon this reversal of rotation of the threaded blank, the ratchet clutch 16 immediately en gages the cooperating ratchet on the end of the holder 13, holding the die head against rotation, so that it will be automatically backed off the work by reversed action of the threads. The parts then again assume the position as shown in Fig. 2 and. are ready for another cut.

This die head may be modified in some particulars without departing from my inprovided vention, and is to be understood that T contemplate all such non-essential variations as fairly fall within-the scope of-my v claims. For example, I have shown the die head as of moderate dimensions,"withr a rel atively small range of adjustment.

fully carrying out the 'principles'of the and from thence opened to any radius with in the range of work for which this type .vention, the die head can be made on a'rlarger scale with a very wide range. of adof tool is adapted: Throughout itsentire' range of adjustment it will be noted the support given the dies is rigid and solid, 3

and the degree of adjustment accurate. 1

uniformly j e5 Having thusdesc'ribed my invention what 7 1 claim and desire to secure by Letters Pat- 611i? ls- 3 1.- A die head having" a ;face plate ovided with guide slotsor grooves arranged:

in a regular figure 4 about the center, a chaserholder forv each groovehaving a H adjustment of the chaser holder, and additional means for clamping all the chaser holders rigidly to the vface. plate when adjusted, so as to prevent any relative motion of the parts during operation.

'QMA die head comprising a face plate with guide slots or grooves forming a regular rectangularfigure about the centena plurality of chaser holders, each having a guide flange fitted to slide in one of said grooves, and each having a second flange or abutment angles to said guide flange, a clamping plate extending over and parallel to said abutment, a chaser held between the abutment and the clamping plate, means for adjusting and locking each holder positively in its groove in the face plate, said means forming a solid and immovable abutment on the face plate for outward thrust of the holder, means for adjusting each chaser longitudinally on its supporting flange or abutment, and additional means to clamp all the parts directly and rigidly to the face plate when adjusted. I

3. A die head comprising a face plate having four face arranged in a regular rectangular fig- .ure aboutthe center, wlth the inner ends of each opposite. pair of grooves crossing a radial line through the center perpendicular to them both, four chaser holders having along one edge at rightguide slots or grooves in its flange fitted to its groove, means for-adjust guide flanges on their backs to fit said grooves, and each having a transverse abutment flange along one edge at right angles to the guide flange, a clampin plate secured upon each holder with its c ge parallel to the abutment flange, a chaser having parallel serrations in its face and held between each abutment flange and clamping plate, four adjusting screws carried in solid abutments or projections on the face plate and bearing against the bodies of the four chaser holders,for radial adjustment and locking support, an adjusting screw carried by each holder with its axis parallel to and engag- 5 ing the body of the chaser thereon for tangential adjustment, and means for clamping all the holders directly and rigidly to the face plate when-adjusted.

4. A die head comprising a face plate 29 having guide slots or grooves extending tangentially to a circle about the center, a projection or abutment rising from the face plate adjacent to the outer end of each slot, a chaser holder havin a flange on its back i as adaptedtoslidc in each groove and an abutment flange on one edge at right angles to the first flange adapted to receive a chaser, a clamping plate for each chaser, an adjusting screw threaded through each projection so or post on the face plate and engaging the outside of the body of the corresponding chaser, holder, a guide screw carried in the body of each chaser holder parallel to the abutment flange and atrright angles to the as aforesaid body screw, a chaser on each holder held by its clamping plate and having threads engaging the threads of said adjusting screw, and means to clean all the holders rigidly and directly to the face plate when adjuste A die head comprising a face plate having guide slots or grooves extending taI1- gentially to a circle about the center, a prcjectiion or post rising from the face plate 46 adjacent to the outer end of each slot, a

chaser holder having a flange on its baclr adapted to slide in each groove and'an abut ineut flange on one edge at right angles to the first flange adapted to receive a chaser,

50 a clamping plate for each chaser, an adjusting screw threaded through each pro jection or post on the face late and engaging the outside of the body of the corre- SDOlHllIlQ' chaser holder, a feod screw carricd in the body of each chaser holder paraland means to clamp all the parts rigidly and directly to the face plate when adjust ed, together with coiipcrating means on the face plate and on each chaser holder, to gage the adjustment.

6. A die head body comprising a face late, provided with grooves or slots in the ace of the plate, constituting. uides for chaser holders, and having pro ections or osts constituting abutments and located immediately adjacent to the several guide slots and bearing graduation or ga marks for accurate ad ustment of the ho ders, together with adjusting means for chaser holders associated with said abutments.

7. A die head comprising a body and a clamping sleeve or stem, having wduated projections on its face for gage a utmcnts, and grooves in its face adjacent to said abutments for guides for chaser holders, said holders, and chasers having longitudinal parallel serrations or ooves in' their fiat sides, locked in the hol ers at predetermined angles to' the respective grooves, whereby rigid support is given the chasers at all points in their feed by said groove and by the abutments, while accurate adjustmeat is also rendered possible,

8. A die head comprisin a face plate, dies or chasers secured to said plate, a carrying plate having a peripheral recess and a tubular stem, a stem for theface plate assing through said tubular stem, so as to were end motion therein, a dog lying in said recess and ivotally secured to the carrying plate, said dog being limited in its movement about its pivot by the side walls of said recess, a cooperating projection carried on the back of the face plate, and a spring normally holding said parts in en agement for cutting, but permitting their disengageuncut at the end of a cut.

9. A. die head comprisin dies or chascrs secured to said ing plate having a pcriphera tubular stem, a stern for the face plate passing through said tubular stem, so as to have end motion therein, a. dog lying in said recess and pivotally secured to the carrying plate, said dog being limited in its movement about its pivot by the side walls of said recess, a cooperating projection carried on tholmck of the face plate, a spring normally holding said parts in engagement for Iplate, a carry recess andv a a face plate, r

cutting, but permitting their disengagement at the end of a cut, said carrying plate having: a. solid projection or abutment at one side of said peripheral recess serving as a stop or guard for the said dog, and a spring tending to throw the dog away from said stop or guard and out of the path of the projection on the face plate.

10. A die head comprising a face plate, dies or chaaers secured to said plate, a carrying plate having a peripheral recess and a tubular stem, a stem for the face plate passinc through said tubular stem, so as to have cud motion therein, a dog lying in said reress and ivotally secured to the carrying plate, said dog being limited in its move ment about its pivot by the side Walls of said recess, a cooperating projection carried on the back of the face plate, a spring nor- 1 mally holding said partsin engagement for cutting, but permitting their disengagement at the end of a cut, and a second spring secured to the carrying late and acting upon the said dog to force it away from the carrying plate and out of the path of the projection thereon- 11. A die' head comprising a carrying plate and a face plate concentrically mounted for relative axial and rotatory movement, said carrying plate having a-peripheral recess, and a dog lying in said recess and ivotally secured to the said carrying p ate, the side walls of said recess limiting the movement of said dog about its pivot, together with a cotiperating projection carried on the face plate and adapted to engage said dog through a fixed range of relative axial movement of the plates.

12. A die head comprising a face plate having a groove across-its face, a chaser holder having a rib guided in said groove, means for adjusting said; chaser holder on the face plate comprising a screw associated with one of the aforesaid elements, a coactingabutment associated with the other said screw being mounted parallel to said slot in the face plate.

13. In a die head in combination, a face plate and a chaser holder mounted on the faceplate for movement across said plate on a predetermined line, means for adjusting said chaser holder with respect to the face plate comprising an abutment to one side of said line of adjustment, a screw threaded in said abutment, said holder being cut away in line with said screw to form a coacting abutment for engagement byv-said screw. a

14. A. die head comprising a face plate and a chaser holder mounted on said face plate for movement across it upon a predetermined line, together with a screw associated with one of said elements and a coacting abutment associated with the other, said screw being substantially parallel to said slot, 1 j

15. A die head comprising a face plate, dies or chasers secured to said plate, a carrying plate having a tubular stem, a stem for the faceplate passing through said tubular stem so as to have end motion therein, a dogpivotally secured to the carrying plate and being limited in its movement about its pivot, a coiiperating projection carried on the back of the face plate, a sliding clutch member mounted on the end of the stem of the face plate and engaging the stem of the the carrying plate,

i,-i races carrying plate in a direction opposite to the engagement of said dog and its coopersting projection, and a spring adapted to draw the said clutch member toward the face plate, whereby in the initial operation of the device said spring maintains the face plate projection in engagement with vthe 4 carrying plate dog, but when the drive is reversed said face plate will tend to reverse its direction of rotation, butthe end sliding clutch will engage the tubular stem of,

and lock the parts. together until the dies are backed off the work.

16. A; die head comprising a body and a stem, a tubular-holder or outer stem adapted to be rigidly held while the work is rotated and to receive said first stem, and two oppositely acting clutch devices, with a spring tending to maintain both clutches in engagement, one clutch engaging during forward drive of the Work and holding the die head against rotation while it is moved in a straight line toward and upon the work, the other "clutch engaging only when the drive of the work is reversed, and acting to hold the die head against rotation during such reversal, whereby retarding of the straight line feed of the die head will produce disengagement of the first clutch and cessation of the cutting, and reversal of the work drive will produce engagement. of the second clutch and hold the die head so that tion but fed in a straight line with respect 7 to the work, two oppositely acting clutches between said tubular holder and the stem of the die, and means to engage one or the other of said clutches automatically according to the direction of drive of the work, and the consequent rotative tendency imparted to the body in the holder, whereby advancin g feed motion of the die will cause it to be held against rotation by one clutch for cutting, retarding of the feed motion will cause the die to'disengage from the holder and rotate idly with the work, and reversal of the'work'will cause the engagement of the .i

second clutch to-hold the die aga nst reverse rotation and by action of the threads on the work to back the die 0d the same.

In testimony whereof I afiix my signature in presenc'e'of two witnesses. I

v -HENRY LANDIS FISHER. Witnesses:

S. F. NEWMAN, 'GUY D. GILBERT. 

